HEX TO BCD Conversion (.asm)
/* This program is not a general program which converts hex to BCD, Here r17 register contains the number that has to be converted to BCD. This works for 8bit BCD This is the fastest algo for 8bit BC*/ .cseg .org 0x00 rjmp RESET /* 1. Clear result MSD. 2. Subtract 10 from the 8-bit input number. 3. If result negative, add back 10 to 8-bit input number and return. 4. Increment result MSD and goto step 2. */ RESET: ldi r17,0x0f ; r17=hexadecimal no. to be converted ; to BCD ldi r18,0x00 ;using the above algo(MSD) ldi r19,10 ;for addition of 10 ldi r20,0x10 ;for multiplication SUBTRACTION: inc r18 subi r17,10 brmi OUTPUT ;checking if result is negative rjmp SUBTRACTION OUTPUT: add r17,r19 subi r18,1 mul r18,r20 ; instead of shifting MSD add r0,r17 break
/* This program is not a general program which converts hex to BCD, Here r17 register contains the number that has to be converted to BCD. This works for 8bit BCD This is the fastest algo for 8bit BC*/ .cseg .org 0x00 rjmp RESET /* 1. Clear result MSD. 2. Subtract 10 from the 8-bit input number. 3. If result negative, add back 10 to 8-bit input number and return. 4. Increment result MSD and goto step 2. */ RESET: ldi r17,0x0f ; r17=hexadecimal no. to be converted ; to BCD ldi r18,0x00 ;using the above algo(MSD) ldi r19,10 ;for addition of 10 ldi r20,0x10 ;for multiplication SUBTRACTION: inc r18 subi r17,10 brmi OUTPUT ;checking if result is negative rjmp SUBTRACTION OUTPUT: add r17,r19 subi r18,1 mul r18,r20 ; instead of shifting MSD add r0,r17 break